I can be found on Facebook, but I tend to be choosy about who I friend. In theory, I can also be found on Twitter. I just don't really USE it that much.
That said, if I don't know you and you want to contact me, your best shot might just be to send me a private message on Twitter.

Yes, I know that's inconvenient. On the other hand, right now, I only get contacted by people who specifically wish to talk to me. I consider that to
be a bonus.

When I have a public E-mail address that I've secured against the fact that it will be immediately inundated in spam, I'll post it here.